Kongsberg Simrad CP200-5C, Installation Manual

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Mount the transducer at a safe distance from bow thruster(s)
Bow thruster propellers are extremely noisy. When you decide where to place the transducer,
you must consider the noise created by most bow thrusters.
When in operation, the noise and cavitation bubbles created by the thruster may make your
CP200-5C transducer useless, almost no matter where it is installed. When the bow thrusters
are
not in operation, the tunnel creates turbulence. If your vessel is pitching, the tunnel may
be filled with air or aerated water in the upper position and release this in the lower position.
In general, the transducer should therefore be placed well away from the bow thruster(s).
However, this is not an invariable rule. Certain thruster designs - combined with their
physical locations on the hull - may still offer a suitable location for the transducer, even
close to the thruster. If you are in doubt, consult a naval architect.
Related topics
Preparations, page 22
Where to install the transducer, page 38
Summary and general recommendations
Some of the installation guidelines provided for transducer location may be conflicting. For
this reason, each vessel must be treated individually in order to find the best compromise.
In general, the most important factor is to avoid air bubbles in front of the transducer face.
For this reason, the recommended transducer location is normally in the fore part of the hull,
well ahead of the noise created by the bow wave.
The maximum distance from the bow is normally equal to one third of the total water line
length of the hull.
Note
Mounting the transducer more than 10–15 meters from the bow may cause problems with
the turbulent flow.
Simrad CP200-5C Installation Manual